Grace is a Mystery – according to (v.9), there are four things that are very obvious about this mystery:
(1) It is God’s mystery…
(2) It is a mystery that has to do with God’s will…
(3) It is a mystery that God has made known…
(4) It is a mystery that gives God great pleasure to reveal – revelation is a very sweet thing to God.
Usually, a mystery is something that’s secret… something that’s hidden (1 Cor 2:1-8). Here Paul is writing about the mystery of grace… According to this text, the mystery of grace is not some closely guarded secret… it’s something that’s revealed…